Stripper for punch-machines.



F. A. STEVENSON.

STRIPPER FOR PUNCH MACHINES.

APPLICATION FILED FEE. I0, 1914. 1,149,226. Patented Aug. 10,1915.

2 SHEETS-SHEET l.

INVENTOR.

A TTORNE Y coLumBlA PLANOGRAPH co4, WASHINGTON, D. c.

F. A. STEVENSON.

STRIPPER FOR PUNCH MACHINES.

APPLICATION FILED FEB. I0, |914.

Patented Aug. 10, 1915.

2 SHEETS-SHEET 2.

KfW-1,5 @A f PT* "71 T* l* I I I I IL N. ATTORNEY WITNESSES coLUMBlAPLANOURAPH CO. WASHINGTON D c 1Fitiiiiinmoir lA. sTEvfENsoNQgoi-ennmnoii, y t l p n firm Fouiinmz COMPANY, orysm.toms',iiiissoiint,liihomogenen;,oii New JERSEY. i

ritieieee.

clear, and eX'aet fdescriptionysueltas ill enable' othersskilled'inttlie"arpt'toiwvliie i it j appei'taiiisfto ineke andtous'e"thefsa'ineij'ei'-1 ei'ence being had to the accoiii anyin'gdiraww ings,which ilii'istiate the preleiredfoijn'ifof as it is obvious/that"variousiinodic'ations' thereof Willocciir to *persons skillediiiltheHart. l :w

V being locked i'iijits vif'oilriholdingvpositien f `during thepunchingoperations,y Vfand, Yuntil `*i'iisaid drawings, Figure l`vIisgafroiit"relevatioii et' a multiple punch vvith strippers forming thesubjeet-inat'ter of this invention applied thereto.."Figllisahorizoiitalt section along' the li'ne/Q--Qo'iiFigf 1I i Fig. 3isa vertical transverse lseetioii *alongi the f line 33 of Fig. l. Fig.:45 is a plan "view of a stripperhookA hereinafter" described,

auditie. 5 is a section thereoftakenfon linej -'jo'c'fFigeL n n t n Mygpresent invention relates tol strippers toi"L punching inachinesyandhas `toi one ot its yprincipal purposes the applieatioii'of aA device ofthis;oharaotervfhiehis capablejof the stripping'y of the W'orkfroni thejpuiiehes has been accomplished during 4 the vreturn vfor upward strokevot saidpun'ohes. Iiiirthjen` more', the design is suiehas'toprovideaninitial kick-`77 asthe punches are about tto befivithdraivn from theworlrfthusjovercoming Whatever friction is" present "betwtfeen the isides of tliekneivlyy made'flioleSi-i'iid'the 4roonsuoli holessTheproinpt, positive aiidfaiitoniatie `release of "theu's'tiipper 'afterthe puneliing land `'Stiiippingr foperatioiis," have been performed,Vand its yimmediate return l other hi ghlv desirable end yla-'ttaiiiedilin the #Miei/item@ Assieivoit irofiiiviERA-VICAN `CAR rsiiiiiiffmoii"removal of j the stripper ""vhen has i pera4 foiinedgits functions--`3Moreover,f theeonf' ystruction of )this fdev'ice' lsiiiiple and4,rugged with` a 'minimized opportunity fr getting out `foi-de1gy Y t l'In saidl drawingsjfa-l he'ag'dspositionedin vordinary' e slotst.`v j

f CPositioiied' above the die p'iineliing"machinesj'"l y y i Dies l2'for' the punches 9 aie so seated Vin AVdie block; 2 "asf tof receivetheir respective -*punehes when' theflatter are carrie'dfdown by *theslide 11.

ltheparts"just aftertlie slide hasoaused the f vpunchesto/traveldoivnt'vaidly and perforate fthe Worin which, intthis case,Y is' 'shown'to be The -"drawingsillustrate 'the ypositions `of v yaf'slieetotcommercially "'i'oiled'fplate 13.. y

Before' the doivnivai'dstrokeof the slide ,l1 4

t into Qthe'space fbetiteen' lthe top t of thev rdie t "block pf'and'theunderside'of thefstiipper le, fsaidfplate "contacting With positioniiigipinsl .i

"'15 and re'st'iiipjoiittop` oi the diebloclr prop? geilyf'lociitetltobe operated upon.` In Fig. 2

fihefpiet'@ is 'Shownfinpifemy dotted lines Afto iiioi'e "readilydistingiiish t itfjand the punches@ are seen to be' distributed so estoproduce` holes desired points throughout f its area.' Any'/otheuairaiigleinent'ioiithe punches and their diesteanjoteourse,beAmade to suit the requirements"Jfthe'vvork inhaiid.'y 4 "i `I Thevariousigiiresshoiv the' plate'13l as having` been perforated, j thepun'cl'ies 'haviiigi` passed i through fap"ertures'y "in" thestripandisfitself looked in poysitionjt y ,n i

The ystripper is ofi sii'ticientieight to i y V1,149,226

Y rmaintain the work in its proper position, but

l5 'wthe die block 2, and to withdraw from theV V pockets 18, permittingstripper 14 to be lift-'f ed by reason ofthe upward travel ofthe slidel1. The stripper hooks are-in the form" of bell crank levers,possessingshort arms v19 toguard` againstdisplacement of said stripperit is locked to the bodyV of the punch through the medium ofstripperhooks 16,

the lower hook ends 17 of which, during the 'punching operations,occupypockets 18,

whichare formed by recesses 'in that part of the 'punch body 1 uponwhich the die block. vr2 rests, in proximity tothe four corners of" saiddie block, andfbythose parts of the die block Y2 whichvoverhang the.recesses in the punch body. vAfter the perforating of the f v plate 13and the'stripping of it from the punches,the stripper hooks 16 arecausedto f disengage themselves y'from the underside of that are perpendicularlto the longarms I which'carry hookends 17.` Theunder surfaces oftheshort arms 19 contain arcuated 'bearing bosses 20 against whichatcertain` times bear 'the' upper lsurfaces `of the headsV t u 21ofstripper bolts y22,vk as" will be hereinafter more fully set forth.Short arms 19 'also' contain holes 23 ofk peculiar formation .e

-throughpwhichfpass Vthe stripper bolts22`. These holes 'are of thatshape `which' would beffgenerated by rocking a VVcylinder' yon its.-base'in a vrstraight line from avertical posi- -tion to aninclinedone; The aperturek thus produced permits the rotation of each stripperhook 16y about its pivotal `point,which,A in the case oftheV aperturehaving the formk fof an ordinary' cylindrical hole, would-be preventedby the stripper bolt 22 passing Vthrough-fthe short arm 19. ln'any oftheinclined positions assumed .by the short arms 19 the curved outlinesof'protuberances 20 present yuniform Acontacting points for the heads'21 of the strippery bolts, whenever the f i latter are caused to engagethe short arms 19.

Detents 24 project .inwardly and slightly v*upwardly from the top ofstripper hooks 16. yThey are intended to limitfthe Voutward movementofthe stripper hooks as they are being disengaged from the lockingposition, and also to cause the short arms 19Jof the.

v stripper hooks to virtually become rigid eX- tensions from thestripper14, whereby the latter'may be lifted,k to itsuppermost positionwhen ythe stripper bolt heads 21k yare in engagement with thevprotuberances 20v'on the underside of the short arms 19, and thestripper bolts 22 are being carried upwardly l bythe slide 11.,V

Stripper hooks 16 are provided at their upper ends v'withpivot holesV25,k whereby` theyy are suspended V from pivot pins 26, the

latter passing also through andbeing sup- Y ported `bylugs 27projectingfrom each cor- Vner of the stripper 14. yNuts are applied tothe threaded ends Vof thepivot pins 26, but

teclear the, dieblock 2 and body 1 in their."

are not tightened sufcientlyto interfere with hingey action Abetweenthelugs 27 and the stripper hooks 16.

kStripper boltsV 22, extending through they short arms 19,-'are securedby nuts 'to brack-gvo ets '28, Vwhich inV turnare bolted vtoifthe f notshown but wellknown the art, the

slide`11 is caused to move downwardly, carrying with it thepunches 9. Atthe begin-V ning ofthe downward stroke ofthe slide 11,

the bearing bosses 20 rest `upon theupper surfaceof thestripper boltheads 21. Q Gravf l i ity causes they stripper 1 4 toyassumethe low` iest position v'that detents 24 and thesides A Theinclinedjpositions'ofsaid shortarmsat this time cause the long arms with hook ends Y 17 toproj ectr outwardly far' enough for them f downward travel. Thisposition is indicated at a in Vdash lines. VWhen the lower surface ofthe stripper 14 reachesthe upper surface of the plate 13, the .stripperholds i the plate firmly in-placeand the pivot pins 1906 26 becomestationary pivotal points about which the stripper hooks swing inwardlyuntil the stripper hook ends 17 occupy the pockets18 in the body 1, andare hooked un-y der the die block 2. If any of the stripper hooks 16stick, so that the preponderance of weight, which is distributedoutwardly lfrom their pivotal points, fails to causethemto *swing* intothel pockets 18, the continued downward movement oftheL slide 11,; and

therefore, the stripper bolts 22 will fresult lin theY stripper boltlheads 21 striking thelong armsof such stripper hooksz16, automati callyforcing them into the4 locking position,

.e., into saidv pockets 18. This continued ll vdownward movement of theslide v11 alsoy carries the punches 9 Athrough V apertures in l stripper14, the plate 13 and into the dies12,f i

The returnorupward stroke of the slide 11 now begins and upon theupwardy movement of ythe punches 9 vthere is a tendency for the plate13k to rise ywith said punches, dueto the friction between the punchesand the walls n of the holes they have created. Any-i such liftingYaction onthepart ofthe plate ,will be abruptly arrested by the tops ofthestripy per hook gends 17 yencountering the under side of thefdieblock 2, thus bringingwhat Y, ever slight upward movement theremay be ofthe stripper 14k to a jolting stop.V The `130 so I' Aof holes-23 intheshortarms 1'9 willfpermit.

` iglesias@ 1 *a l punches meantime vcontinue 'i theiliiA 'upward uppeisurfaces of i the stripper bolt heads yE21y have come rinto contact with"thefpi-otuberances on theuinder sidef'of thelslioitai'his 19 of thestripperfl'i'olis l'faiidsaid stripperihoks rotate about the y p Wardtiayel Y of ment in Shen musi@ Cabout piiotfpins `2o. The 'stripper hookends ijif Lmove Inovethe detents Q4 coming into "engagement 'with theupper suiliace 'of the stiippei 14. a This position of t'hepatsis'fshotvn ldota'nd dash lines at `b,`an"d said pai't's fate` held inthe saine relationship "as the stripper 14 and t' the stfipper; hooks"io are earned byjthe strippieiebeit heads 21j toi-the dash use positionShown a, w'vhc'h fis the Santing point and', hence, tthel cycle yof"operation's` is coni-` *pletel5 and after 4the plate 13 i-'enioved,

anotheil y'such yplate may "be 'iifiseited and "oprated uponinthe'f's'aine mannen."

punches 'tlieetli'1ou'5gh-,' attachment inembeis on said stiifppei andposition-changing and suppoitlngineans connected to ysaid 'attachf` @jadapted to be actuated by saidfslide;

2. ln a multiple punch having 7arche-,oar- 'rying 'die block and punchesfcaiji'iedfby 'f a reo'ipiocatory slide, fa lockable *stripperperit'oiated for `-thepassage 'saidv punches,` integi'allilg'son saids'tiip'pei, andfnielanscariied by said lugs adapted in one position toevlock "said stippei" inta `-Work#holding' position.

rying die block and i punches fcairied j by a re cipi'ocatoiy slide,y arYlo'cliabl'e fstiippei" pei'- oiated" 'for the pas'sage of `said gpunches,l inte'gial lugs on 'said strippen, stripper fhooks pivoted tosaidv lugs and 'adapted'in- 'one lpositiony to engagefsad 'die blockytolock saidl stripper in a Woik-holding f po's'itiomf and to:

impart a punch-freeing [kick to the Woik through said stripper. i

4. In 'al 'multiple *punchhaving aydie blocll and a iecipi'ocatorypunch-carryingfslide, a y

- ingfdie block secured toV body lianie and lockable stripper,in'tegia'l lugs thereon7 a plurality of stripper hooks piyotallyutf'tached to said lugs,I each hool comprising a locking zneinbeif,` yan'unlocking ineinbei and a throw-limiting device `fo: said hook, said les' unlocking "nfi'einberf and throw-limiting "de-` vice coactiiig incertain positions to connect changing nieans;

ippei': toj'suppoiting 'and positionfa'pliirality of stripper 'hookspivotally attached to said lugs, each hook vcoinpi'ising" a ylockingaiin with a `hooledfend adapted to engage 'saidfdie block,anunlocking arm and f ysti-ipper#engagi'ng "detent',` co-acting at'IiieSiVith said 'lilnlo'cliing aiin to holdsaidstripperfinsuspension-l; I

- on in a aaiiupie paneahavihg digfbiok and a iecipiocatoiyp'unoh'cariying slide', a g lockablesti'ippei7 a plurality "of stippel-`Q/liools'piyotally Connected to said stripper, y"each hook coinpifisinga 'stripper-engaging `"detent, a looking aun andan unlocking arm,Ja'cuated ybearing bosses-fon said unlocking i erin, 'a'nd''aposition-adaptingaperture there!` i`n-, headed inean's passingthi'oughsaid ape'rfj 5'.y In a v'niultiple punch haying "a L die-block fand aifeciprocatory pun'chc'aiifying slide, a lockablesti'ippeig integrallugstheieorn` and,r4

sof

ture, joapablel ofcali'ying eachlocking aim Y "toits locking position,and of engaging said "beating bosses to unlock said stripper kand toicaus'efsaid detent to 3o-act `With said headed means andy saidunlocking aiin to xi'aise andlowe'i' said stripper.

. In alinultiple punch having a die-carryingdie block secured to a body`i'ia'nneand i"punches carried by a iecipiocatoiyslide'a lockablestripper apeituied lion the passage y f punches therethrough, apluralityof stripper hooks, suppoi'tingineans therefor fc'ai'iied 4byrsaid stripper, each stiippei hook being adapted 1n vone position ytoengage said block `to'flocl; said stijippei thereto, and tol inipat apunchglii-eeingkick through said stripper y'to rsaid Work, and aplurality of *headed stip'pei bolts Lnormally holding said 'fstiuppeninsuspension, but adapted to be actuated yby "the movement in onedirection of'saiid 'slide to lower said stripper and to force saidstripper` hooks intol locking post tions,r rand upon a reif'eisal ofsuch Inove` ment to unlock said stripper hooks and toV` i yj-etuinsaidstrippei' to itsnoiinalposition.

*8; In a gi'niiltiple punch'hayingfa diefoai'iyiii'g 'die-blockseciii-edygtofa' "bodyfraine and punches "caiified it Tecipiocatoiyslide, a js'stiixiipeif ad ptedto holdivork inplace upon said diebloel-by its Weight, means carried ""byjsaid stiipper i'or locking thelatter inav 4v""itfto release said Work.

9;'ln aniultiple punch having a die-caiiiyy"punchesV carried by ai'ecipi'ocatoi'y slide,' a

lockable stripper adapted to'ietain Work in placeiipon said die block, apluiality of inpiotally secured to each lug,^sa1d stripper "hooks beingvaiduf'ipted to lock said-strippen isoL y tosaid die block duringpunching and strip? ping operations and to cause said workfto bestrippedfrom saidpunches by imparting a kick to--saird stripper, and meanscarried Aby said slidefor rotating said stripper hooks' to unlocksa'idstripper from said diesblock 7 and to raise it fromfsaid work.

` ally affixed to each lug, each stripper .hook

` 10. In a multiple punch having a die-.carryto holdia piece ofworlr,locking means carried by Ysaidstripper adapted to lock` the l latter tosaid die-bloclr during punching and stripping operations, saidsupporting means t upon' theascent of said slide and after saidoperations'actuating said locking means to release said stripper fromsaiddie block and to raise it toits normal vupper position).

11. In amultiple punch having a die-carrying die block secured to a bodyframe and p punches carried by V'a reciprocatory slide, a

lockable stripper apertured for thepassage f of said punchestherethrough, a Vpluralityof integral lugs thereon, a ,stripper hookpivot comprising along arm with a hook end, an

integral short arm angularly disposed there-V toand having an aperturetherein and arcuatedbearing bosses, and an integral stripperengagingdetent, a plurality ofv headed stripperbolts, each secured-to said slideand passing through one of said short arm apertures, whereby saidstripper is, normally suspended from the heads of said stripper boltsthrough said short Varms and stripper detents of said stripperihooks,said vhooked long arms beingheld in a` disengaging positionY but adaptedupon the descent of said slide, stripper and stripper bolts to swingtheir hook ends under said die block to lock` said stripper thereto.

l12'.V In a ,multiple punchV Ahaving a die- I carrying die block securedto a-body frame and punches carriedpby a reciprocatory slide,Y alockable stripper. apertured forY the passage ofk said punchestherethrough, a plurality ofk integral lugsthereon, a stripper hookpivotally aiiixed to each lugV each stripper hook'comprising a long arm'with y a hoolrend, an integral shortA arm angularly disposed thereto andhaving an aperture therein and an integral stripper-engaging detent, a'plurality of headed stripper bolts, each secured toy said slide andvpassing -through one of said short armyapertures,

whereby said stripper is 'normally held in suspension, and upon thedescent of said slide rests upon and holds workin place, said hookedlong arms vswinging beneath said die `block to lock said stripperthereto `and upon the ascent of said slidensaid stripper hookslbeing-caused to impart-a punch` freeing kick through .said stripper tosaid gagernent of, said stripperhooks and die block and throughjtheagency of, said short said strippertoY arms and detentsjto returnits normal position.

13. In a multiple punch work, lthe heads of said stripperbolts engagingsaid vbearing bosses to cause the disen having a die-carrying dieblocksecured to aybody frame and;v

punches carried by a reciprocatory slide, a'` y' a lockabler stripperadapted to retain Work in y,

place .upon said die block, a plurality of i11-l tegral lugs on saidstripper, lastripper hook pi'votally secured .to eachl lug, saidstripper hooks being adapted to lock sa'idfstripper v tosaid Vdievblockduringpunching and strip'-y ping 1operations, each stripper hookVrcomprising a long hoolrarm, a stripper engagingl detent and an integralshort arm anguture therein,said'` aperture beingy ofa form toperinit theautomatic adjustment without disengagement of vsaid stripperhoolr short`larm and a `stripper bolt passing there-y through, each stripper boltbeing'suspended from saidY slide and adapted to engageitsrespectiveshort arm and rotate Ythe same to unlock said stripper ,hookYfrom said dic block, andtoreturn said'A 'stripper to its y upperposition.

V14.V` In combination ina punching machine, a movable member, a ,punchcarried thereby, a stationary die-carrying member,

astripper interposed between both members anilmeans forfcarrying saidstripper into and?" out of a work-holdingv position and 'in (the latterposition-.locking it to said stationary member. l Y

15. In ycombination in a punching machine, suitably'mounted die-carryingdieblock, a reciprocatory punch-carrying slide, a. stripper lperforatedfor punch-passage, stripperfcarrying lmeans secured to Y said slide andmeans adapted at .-timeslto cause saidstripper-carrying means andstripper to move synchronously and at other times to Y loclr'saidstripper to said die-block.`

16; In{ combination in -apunchingv ina-j chi-ne, a stationarydie-block,a punch-carry ingV slide, a 'stripper perforated forVpunchpassage, `stripperfcarrying y means movable withl said'slide anddevicesadapted to clutch said stripper-and its Vcarrying' means vduringypart-ofthe movements of the latter'and to effect a release therebetweenand a locking of said stripper to said die-block during the release.interval. y

17. In combinationin a punching mwa-l chine, va stationary diefbloclr, apunch-carrying reciprocatory slide, 4stripper-carrying v meansdependingtherefrom, a stripper and cause said stripperecarryingkmeans to lowerthe `stripper to retain work by its lweight .85` l larly disposedthereto. and having anaper devices .carriedby said stripperadaptedto isostripper chine7 a stationary die-bloclngaJ punch-.carryi mgreciprocatory slide, stripper-carrying i means `depending therei'romrastripper and devices carried by said stripper adapted to i cause saidstripper-carrying means to lovver the 4stripper to retain Work` by itskWeight` andaiso to reiease the stripperfrom said strippencarrying meansand to lock it inits Work-retaining position, said stripper-carryingmeans being adapted to force said devices into stripper-lockingpositions. n

, 19. In combination in a punching machine7 a die-block secured to aframe, a punch-carrying reciprocatory slide, strippercarrying meansdepending therefrom, a and locking devices pivotally mounted on saidstripper, each comprising a member' for locking said stripper to thediebloclr and other members inoperatively `connecting said stripper andits carrying-means Copies of this ypettentmey be obtained for While thestripper and die-block arev` in,y locked relation and rigidly connectingthem at other times to move said stripper.

20,` In combination in a punching machine, a stationary die-bloclnvapunch-carry-y ing slide, stripper-carrying members depending therefrom,a stripper and devices pivotally `mounted on said strippereachcomprising a member adapted to lock the stripper toisaid die-block andother `members for releasing and locking together said.

strippers and its carrying members when said stripper is locked orreleased from said die-block, respectively, one of the latter membershaving an aperture therein for the passage of one of saidcarrying-members, said aperture having a form permitting the devicecontaining it to turn. I

In Witness whereof I have hereunto set my hand in the presence of; twoWitnesses. FREDERICK A. STEVENSON. Witnesses: l

ELIOT W. STUDER, ARNOLD L. PLPPER.

vecentsV each, byaddressing the Commissioner of Patents, Washington, D.C. 1 f

